nassh: add SSH-FE relay support

This is a bit rough, but largely works.

The nassh.Agent logic needs reworking, but that module needs a lot of
rework to better use typed arrays, so we won't get into that here.

Documentation is missing, but we'll add that once things settle.

The ssh key selection relies upon Google-specific agent messages which
means it's limited to gnubbies currently which is unfortunate.

The ACK protocol is an artifact of the frontend proxies, and is the
same as implemented in nassh_stream_google_relay.js, although the
implementations are independent currently.  It'd be nice to unify
them somehow.

Along those lines, we don't support connection resumption.  But the
current SSH-FE servers don't either, so it's not like we've lost any
functionality.

Bug: 776106
Change-Id: Ifc74e3ce4f1d3636b55dfb9a7d2d8468cde20997
Reviewed-on: https://chromium-review.googlesource.com/c/1390226
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Vitaliy Shipitsyn <vsh@google.com>
8 files changed
tree: 4d0fef7eb70acc33d82e3988e46ef83e5066e053
  1. hterm/
  2. libdot/
  3. nassh/
  4. saltpig/
  5. ssh_client/
  6. wam/
  7. wash/
  8. .clang-format
  9. .eslintrc.js
  10. .gitignore
  11. .pylintrc
  12. Dockerfile
  13. HACK.md
  14. LICENSE
  15. navbar.md
  16. package.json
  17. README.md
README.md

Hello

This repository contains the libdot JavaScript library and some web applications that make use of it.

The official copy of this repository is hosted at https://chromium.googlesource.com/apps/libapps.

There is also a mirror on github at https://github.com/libapps/libapps-mirror. A few subprojects are also extracted out into their own git repo and mirrored. Keep in mind that these mirrors may occasionally be behind the official repository.

All changes must go through the Gerrit code review server on https://chromium-review.googlesource.com. Github pull requests cannot be accepted. Please see the HACK.md document in this directory for the details.

Top level directories

  • libdot/ is a small set of JS libraries initially developed as part of hterm, now available as shared code.

  • hterm/ is a JS library that provides a terminal emulator. It is reasonably fast, reasonably correct, and reasonably portable across browsers.

  • nassh/ is the Secure Shell Chrome App (currently a “v1.5” app, soon to become a “v2” or platform app) that combines hterm with a NaCl build of OpenSSH to provide a PuTTY-like app for Chrome users.

  • ssh_client/ is the NaCl port of OpenSSH. It is used by nassh to create the Secure Shell App.

  • wash/ is a library for cross-origin virtual filesystems, similar to the Plan 9 filesystem. This directory also contains a simple bash-like shell environment for exploring these filesystems. The code in this directory is a work-in-progress.